Reference shapes

[maltezfaria]

Implements some reference shapes to be used later for both interpolation and integration. Together with a push-forward map, this will later be used to interpolate and integrate over arbitrary elements.

Left to do:

• Combine ReferenceTriangle and ReferenceTetra into a ReferenceSimplex{N}, similar to what is currently done for ReferenceHyperCube
• Improve coverage with more testing

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (bad3773) 0.00% compared to head (9e3e08c) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           main        #2        +/-   ##
===========================================
+ Coverage      0   100.00%   +100.00%     
===========================================
  Files         0         3         +3     
  Lines         0        19        +19     
===========================================
+ Hits          0        19        +19     

Files	Coverage Δ
src/Geometry/referenceshapes.jl	100.00% <100.00%> (ø)
src/Inti.jl	100.00% <ø> (ø)
src/utils.jl	100.00% <100.00%> (ø)

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[maltezfaria]

Is ready for a review? Thanks for the improvements.

[maltezfaria]

Also, I think we should drop support for 1.6 (not worth it, specially as things start to become more complex).

[maltezfaria]

Left some minor comments. I can handle them tomorrow, just wanted to point out what might change.

[tanderson92]

@maltezfaria I don't understand what you mean by how the vertex test constructors are ``too verbose'' -- if there is a more efficient way to test the expected output of vertices I'm all for it, but I didn't know how.

[maltezfaria]

@maltezfaria I don't understand what you mean by how the vertex test constructors are ``too verbose'' -- if there is a more efficient way to test the expected output of vertices I'm all for it, but I didn't know how.

I meant that

SVector{3, SVector{2, Int64}}([0, 0], [1, 0], [0, 1])

can be replaced by

SVector([0, 0], [1, 0], [0, 1])

and the tests will still pass.